Toothbrush



FIG. 1 is a top, front and right side perspective view of a toothbrush showing the new design;

FIG. 2 is a right side view thereof;

FIG. 3 is a left side view thereof;

FIG. 4 is a top view thereof;

FIG. 5 is a bottom view thereof;

FIG. 6 is a rear view thereof; and,

FIG. 7 is a front view thereof. 

The ornamental design for a toothbrush, as shown. 